無限充電技術 - Android

By Margaret
at 2012-05-21T20:20
at 2012-05-21T20:20
Table of Contents
※ 引述《huabandd (我是阿肥巴你頭)》之銘言:
: 前一陣子有稍稍上網搜尋這個東西
: 發現docomo有一隻可以這樣充電
: 但我記得sanyo j88也是無限充電技術
: 但為什麼docomo的充電器會那麼大
: 是考量到要能夠快速充電的關係嗎
: 不然j88可是十年前就有了
: 可是無限充電技術卻沒什麼發展
: 有人對這一塊有研究的嗎?
很不巧的,小弟的論文剛好就是這...XDXD
如果你對無線充電有疑問,可參考小弟的論文.
請私信+自己用論文系統抓......0.0羞
-------------------------------------------------------------
大略分享一下,無線充電的教父就是尼古拉.特斯拉,電生磁,磁生電.國小都教過的!
至於現在不能普及只有一個原因就是'效率'!
無線傳輸時,會用switch power把DC/AC變高頻AC,產生磁通量(m.flux)
再把用線圈(網子)把磁通量抓回來,變成電,AC->DC
這過程有[交換式電源耗損],[漏磁通],[整流耗損],
再來根據冷次定律,磁通量與距離[平方]成[反比],
所以你如果離發射器太遠,漏磁通超多,也就是你打出去的能量都跑光光,
然後漏磁通與線圈的電感與電阻有關,有個Q factor(Q值,可決定效率)
當Q值越高,效率越好,問題是Q值由感抗與阻抗決定,
所以如果要提高Q值,就是感抗越高越好,阻抗越低越好,
感抗要怎麼提高呢? 除了設計奇形怪狀的線圈外,最有效就是加大電感的半徑.
阻抗怎麼降低呢? 材料! 用個純銀導線吧!做出一組線圈,高Q,效率就很高!
最有名就是幾年前MIT做出來的高Q傳輸設計,一公尺可達60%效率
問題是他的線圈....非常大,砂鍋大的線圈,線圈一個就一公尺多那麼大..怎麼做到手機呢!
所以有點距離的無線傳輸,根本不可行,因為要不就很大一個線圈,
如果線圈小,Q就低,效率非常可悲...根據實驗,50公分大概剩下1%..
只能點亮個小LED燈或計算機吧!
至於充電更不用說了,充到炸掉都沒充到.
由於要做成手機設備,所以一定是使用交換電力電路,
你可能會說效率很低,我就大火力輸入就好,問題是火力越大,會有很多熱損,
(因為你Q不夠),想當年那時候在做實驗,給他火力全開20W灌下去,溫度飆到180度以上,
銲錫都溶解...
所以..."有"距離無線充電,目前應該是無解,除非能發現一種很神祕的外星材質或繞法,
做出來體積小,Q又超高!
既然有距離不行,那就來個零距離接觸吧!就是你最常見的貼著的充電,
像:palm charge stone, 電動牙刷...等
一般來說,如果是可攜裝置大小,頻率定在100KHz左右,
距離就像貼近這樣<1cm,效率應該可以來個30%吧!
如果你今天要充一個手機,以GALAXY NOTE為例,他的電池供率是9.25Wh,
你就得灌30Wh給他,現在油電雙漲,又講求節能減碳,
這種無線充電實在有點浪費啦!還是乖乖的插線充好了
--
: 前一陣子有稍稍上網搜尋這個東西
: 發現docomo有一隻可以這樣充電
: 但我記得sanyo j88也是無限充電技術
: 但為什麼docomo的充電器會那麼大
: 是考量到要能夠快速充電的關係嗎
: 不然j88可是十年前就有了
: 可是無限充電技術卻沒什麼發展
: 有人對這一塊有研究的嗎?
很不巧的,小弟的論文剛好就是這...XDXD
如果你對無線充電有疑問,可參考小弟的論文.
請私信+自己用論文系統抓......0.0羞
-------------------------------------------------------------
大略分享一下,無線充電的教父就是尼古拉.特斯拉,電生磁,磁生電.國小都教過的!
至於現在不能普及只有一個原因就是'效率'!
無線傳輸時,會用switch power把DC/AC變高頻AC,產生磁通量(m.flux)
再把用線圈(網子)把磁通量抓回來,變成電,AC->DC
這過程有[交換式電源耗損],[漏磁通],[整流耗損],
再來根據冷次定律,磁通量與距離[平方]成[反比],
所以你如果離發射器太遠,漏磁通超多,也就是你打出去的能量都跑光光,
然後漏磁通與線圈的電感與電阻有關,有個Q factor(Q值,可決定效率)
當Q值越高,效率越好,問題是Q值由感抗與阻抗決定,
所以如果要提高Q值,就是感抗越高越好,阻抗越低越好,
感抗要怎麼提高呢? 除了設計奇形怪狀的線圈外,最有效就是加大電感的半徑.
阻抗怎麼降低呢? 材料! 用個純銀導線吧!做出一組線圈,高Q,效率就很高!
最有名就是幾年前MIT做出來的高Q傳輸設計,一公尺可達60%效率
問題是他的線圈....非常大,砂鍋大的線圈,線圈一個就一公尺多那麼大..怎麼做到手機呢!
所以有點距離的無線傳輸,根本不可行,因為要不就很大一個線圈,
如果線圈小,Q就低,效率非常可悲...根據實驗,50公分大概剩下1%..
只能點亮個小LED燈或計算機吧!
至於充電更不用說了,充到炸掉都沒充到.
由於要做成手機設備,所以一定是使用交換電力電路,
你可能會說效率很低,我就大火力輸入就好,問題是火力越大,會有很多熱損,
(因為你Q不夠),想當年那時候在做實驗,給他火力全開20W灌下去,溫度飆到180度以上,
銲錫都溶解...
所以..."有"距離無線充電,目前應該是無解,除非能發現一種很神祕的外星材質或繞法,
做出來體積小,Q又超高!
既然有距離不行,那就來個零距離接觸吧!就是你最常見的貼著的充電,
像:palm charge stone, 電動牙刷...等
一般來說,如果是可攜裝置大小,頻率定在100KHz左右,
距離就像貼近這樣<1cm,效率應該可以來個30%吧!
如果你今天要充一個手機,以GALAXY NOTE為例,他的電池供率是9.25Wh,
你就得灌30Wh給他,現在油電雙漲,又講求節能減碳,
這種無線充電實在有點浪費啦!還是乖乖的插線充好了
--
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